I noticed that in my Notifications system preferences there two entries for Twitter (the old one with the white icon) and the new one.
The old Twitter application is long gone. How can I remove obsolete entries in the list?
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If you click on the Help Center (?) icon (lower right of the Notifications pane), it says: To remove an app, drag it to the Not in Notification Center list.
Apps can be rearranged in the Notification Center by dragging them up / down in the list. 'Not in Notification Center' is at the bottom of the list. drag the app(s) you don't want to the very bottom, until you see a horizontal line appear beneath Not in Notification Center, then release. i'm not sure, however, if this will permanently remove the app from the list of apps in the Notification Center.